|x - 8| + 12 = 25
|x - 8| = 25 - 12
|x - 8| = 13
\(\left[ \begin{array}{l}x-8=13\\x-8=-13\end{array} \right.\)
\(\left[ \begin{array}{l}x=13+8\\x=-13+8\end{array} \right.\)
\(\left[ \begin{array}{l}x=21\\x=-5\end{array} \right.\)
Vậy x = 21 hoặc x = -5